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Rectification induced by geometry in two-dimensional quantum spin lattices.

Alessandra Chioquetta1, Emmanuel Pereira, Gabriel T Landi2

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Geometrical asymmetry drives spin rectification in quantum spin chains. This phenomenon, observed in XXZ and XX models, suggests geometry

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Area of Science:

  • Condensed Matter Physics
  • Quantum Mechanics
  • Spintronics

Background:

  • Investigating spin rectification in quantum systems is crucial for developing novel electronic devices.
  • Understanding the influence of system geometry and boundary conditions on spin transport is an active research area.

Purpose of the Study:

  • To explore the role of geometrical asymmetry in inducing spin rectification in two-dimensional quantum spin chains.
  • To analyze the impact of anisotropy and boundary drives on spin rectification coefficients.

Main Methods:

  • Modeling two-dimensional quantum spin chains with two boundary reservoirs using quantum master equations.
  • Numerical calculations of the rectification coefficient (R) for the anisotropic XXZ model.
  • Investigating different boundary drive configurations, including local and nonlocal dissipators.

Main Results:

  • Geometrical asymmetry is shown to be a key factor in achieving spin rectification.
  • Spin current rectification is observed in both the XXZ model with varying anisotropy and boundary drives.
  • The XX model also exhibits spin current rectification when geometrical asymmetry and inhomogeneous magnetic fields are present.

Conclusions:

  • Geometrical asymmetry can induce spin current rectification in quantum spin systems.
  • The findings suggest that geometric effects on rectification are general and applicable to various quantum spin models.
  • This work provides insights into designing spintronic devices based on geometric control of spin currents.